8 Del. C. § 615: Conversion into business corporation.

Whenever all shareholders of a professional corporation cease at any time, and for any reason, to be licensed, certified or registered in the particular professional service or at least 1 of the qualified related professional services for which such professional corporation was organized, the professional corporation shall thereupon be treated as converted into and shall operate henceforth solely as a business corporation under applicable provisions of Chapter 1 of this title, exclusive of this chapter.